Now in paperback, David Grossman's internationally acclaimed, evocative a fable of parental grief--a powerfully wrought exploration of understanding and acceptance.     David Grossman, a writer whose exceptional humanity, grace, and sheer brilliance as a storyteller have earned him acclaim around the world, has created an inspiring, compassionate, and genre-defying drama--part play, part prose, and a fable of pure poetry--to tell the story of bereaved parents setting out to